diff --git a/Gemfile.lock b/Gemfile.lock
index 6d3bcf5..858b0e5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,26 +1,31 @@
 PATH
   remote: .
   specs:
-    vcardigan (0.0.8)
+    vcardigan (0.0.9)
 
 GEM
   remote: https://rubygems.org/
   specs:
     coderay (1.1.0)
-    diff-lcs (1.1.3)
+    diff-lcs (1.5.1)
     method_source (0.8.2)
     pry (0.9.12.6)
       coderay (~> 1.0)
       method_source (~> 0.8)
       slop (~> 3.4)
-    rspec (2.12.0)
-      rspec-core (~> 2.12.0)
-      rspec-expectations (~> 2.12.0)
-      rspec-mocks (~> 2.12.0)
-    rspec-core (2.12.2)
-    rspec-expectations (2.12.1)
-      diff-lcs (~> 1.1.3)
-    rspec-mocks (2.12.1)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.0)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.1)
     slop (3.4.7)
 
 PLATFORMS
@@ -28,5 +33,8 @@ PLATFORMS
 
 DEPENDENCIES
   pry
-  rspec (~> 2.0)
+  rspec (~> 3.0)
   vcardigan!
+
+BUNDLED WITH
+   2.5.7
diff --git a/lib/vcardigan.rb b/lib/vcardigan.rb
index 0cfd4b1..1baa9c3 100644
--- a/lib/vcardigan.rb
+++ b/lib/vcardigan.rb
@@ -16,6 +16,14 @@ def parse(*args)
       VCardigan::VCard.new.parse(*args)
     end
 
+    def parse!(*args)
+      VCardigan::VCard.new.parse(*args, strict: true)
+    end
+
+    def parse_all!(io, skip_invalid: false, &block)
+      VCardigan::VCard.parse_all(io, skip_invalid: skip_invalid, &block)
+    end
+
   end
 
 end
diff --git a/lib/vcardigan/errors.rb b/lib/vcardigan/errors.rb
index 5ebf7cc..d19e94c 100644
--- a/lib/vcardigan/errors.rb
+++ b/lib/vcardigan/errors.rb
@@ -1,3 +1,29 @@
 module VCardigan
-  EncodingError = Class.new(StandardError)
+  class Error < StandardError
+    class << self
+      attr_accessor :default_message
+    end
+
+    def initialize(message = nil)
+      super(message || self.class.default_message)
+    end
+  end
+
+  class EncodingError < Error; end
+
+  class MissingEndError < EncodingError
+    self.default_message = "vCards must end with an END:VCARD line"
+  end
+
+  class MissingVersionError < EncodingError
+    self.default_message = "vCards must include a VERSION field"
+  end
+
+  class MissingFullNameError < EncodingError
+    self.default_message = "vCards must include an FN field"
+  end
+
+  class UnexpectedBeginError < EncodingError
+    self.default_message = "vCard has more than one BEGIN:VCARD line"
+  end
 end
diff --git a/lib/vcardigan/vcard.rb b/lib/vcardigan/vcard.rb
index 8fd6df6..ff4327c 100644
--- a/lib/vcardigan/vcard.rb
+++ b/lib/vcardigan/vcard.rb
@@ -1,3 +1,5 @@
+require 'stringio'
+
 module VCardigan
 
   class VCard
@@ -6,6 +8,37 @@ class VCard
     # it's not terminated
     UNTERMINATED_QUOTED_PRINTABLE = /ENCODING=QUOTED-PRINTABLE:.*=$/
 
+    class << self
+      def parse_all(io, skip_invalid: false, &block)
+        io = StringIO.new(io.to_s) unless io_like?(io)
+
+        enumerator = Enumerator.new do |yielder|
+          loop do
+            break if io.eof?
+
+            begin
+              vcard = new.parse(io, strict: true)
+              yielder << vcard if vcard
+            rescue VCardigan::EncodingError => e
+              raise e unless skip_invalid
+            end
+          end
+        end
+
+        if block_given?
+          enumerator.each(&block)
+        else
+          enumerator
+        end
+      end
+
+      private
+      
+      def io_like?(obj)
+        obj.respond_to?(:each_line) && obj.respond_to?(:eof?)
+      end
+    end
+
     attr_accessor :version
     attr_accessor :chars
 
@@ -24,13 +57,15 @@ def initialize(options = {})
       @group = nil
     end
 
-    def parse(data)
-      lines = unfold(data)
+    def parse(data, strict: false)
+      self.version = nil if strict
+      lines = unfold(data, strict: strict)
+      return nil if lines.empty? && strict
 
       # Add the parsed properties to this vCard
       lines.each do |line|
         if line =~ /^VERSION:(.+)/
-          @version = $1
+          self.version = $1
           next
         end
 
@@ -38,6 +73,9 @@ def parse(data)
         add_prop(property)
       end
 
+      raise VCardigan::MissingVersionError if strict && self.version.nil?
+      raise VCardigan::MissingFullNameError if strict && !@fields.has_key?('fn')
+
       self
     end
 
@@ -170,27 +208,42 @@ def fullname(*args)
     # lines to be inserted for readability - it does this by dropping zero-length
     # lines.
     # Borrowed from https://github.com/qoobaa/vcard
-    def unfold(card)
+    def unfold(card, strict: true)
       unfolded = []
 
+      passed_begining =  0
+      passed_ending = 0
+
       prior_line = nil
-      card.lines do |line|
+      card.each_line do |line|
         line.chomp!
         # If it's a continuation line, add it to the last.
         # If it's an empty line, drop it from the input.
         if line =~ /^[ \t]/
+          next if strict && passed_begining.zero?
           unfolded[-1] << line[1, line.size-1]
-        elsif line =~ /(^BEGIN:VCARD$)|(^END:VCARD$)/
+        elsif line =~ /^BEGIN:VCARD$/
+          passed_begining += 1
+          raise VCardigan::UnexpectedBeginError if strict && passed_begining > 1
+        elsif line =~ /^END:VCARD$/
+          passed_ending += 1
+          break if strict
         elsif prior_line && (prior_line =~ UNTERMINATED_QUOTED_PRINTABLE)
+          next if strict && passed_begining.zero?
           # Strip the trailing = off prior line, then append current line
           unfolded[-1] = prior_line[0, prior_line.length-1] + line
         elsif line =~ /^$/
         else
+          next if strict && passed_begining.zero?
           unfolded << line
         end
         prior_line = unfolded[-1]
       end
 
+      if strict && passed_begining.positive? && passed_ending.zero?
+        raise VCardigan::MissingEndError 
+      end
+
       unfolded
     end
 
@@ -225,8 +278,7 @@ def add_prop(property)
 
     def validate
       unless @fields['fn']
-        raise VCardigan::EncodingError,
-          "vCards must include an FN field"
+        raise VCardigan::MissingFullNameError
       end
     end
 
diff --git a/spec/examples/vcard_spec.rb b/spec/examples/vcard_spec.rb
index 767e640..af70976 100644
--- a/spec/examples/vcard_spec.rb
+++ b/spec/examples/vcard_spec.rb
@@ -357,4 +357,167 @@
       end
     end
   end
+
+  describe '#parse!' do
+    context 'invalid vCard' do
+      let(:data) { File.read(File.dirname(__FILE__) + '/../helpers/joe.vcf') }
+      let(:vcard) { VCardigan.parse!(data) }
+      let(:fields) { vcard.instance_variable_get(:@fields) }
+
+      context 'when the fields are out of order' do
+        let(:data) { File.read(File.dirname(__FILE__) + '/../helpers/scrambeled_joe.vcf') }
+
+        it 'ignores all fields before the begin line and after the end line' do
+          expect(fields).not_to have_key('n')
+          expect(fields).not_to have_key('email')
+          expect(fields).to have_key('fn')
+          expect(vcard.fullname.first.value).to eq('Joe Strummer')
+          expect(vcard.email).to be_nil
+        end
+      end
+
+      context 'when the version is missing' do
+        let(:data) { File.read(File.dirname(__FILE__) + '/../helpers/no_version.vcf') }
+
+        it 'raises an error' do
+          expect { vcard }.to raise_error(VCardigan::MissingVersionError)
+        end
+      end
+
+      context 'when the end line is missing' do
+        let(:data) { File.read(File.dirname(__FILE__) + '/../helpers/no_end.vcf') }
+
+        it 'raises an error' do
+          expect { vcard }.to raise_error(VCardigan::MissingEndError)
+        end
+      end
+
+      context 'when the full name is missing' do
+        let(:data) { File.read(File.dirname(__FILE__) + '/../helpers/no_fullname.vcf') }
+
+        it 'raises an error' do
+          expect { vcard }.to raise_error(VCardigan::MissingFullNameError)
+        end
+      end
+
+      context 'when there are multiple begin lines' do
+        let(:data) { File.read(File.dirname(__FILE__) + '/../helpers/multiple_begin.vcf') }
+
+        it 'raises an error' do
+          expect { vcard }.to raise_error(VCardigan::UnexpectedBeginError)
+        end
+      end
+    end
+
+    context 'valid 4.0 vCard' do
+      let(:data) { File.read(File.dirname(__FILE__) + '/../helpers/joe.vcf') }
+      let(:vcard) { VCardigan.parse!(data) }
+      let(:fields) { vcard.instance_variable_get(:@fields) }
+
+      it 'should set the version' do
+        vcard.version.should == '4.0'
+      end
+
+      it 'should only have one version property' do
+        vcard.to_s.lines.count {|l| l =~ /^VERSION:/ }.should == 1
+      end
+
+      it 'should add the properties to the fields array' do
+        fields.should have_key('n')
+        fields.should have_key('fn')
+      end
+    end
+
+    context 'google 3.0 vCard' do
+      let(:data) { File.read(File.dirname(__FILE__) + '/../helpers/google.vcf') }
+      let(:vcard) { VCardigan.parse!(data) }
+      let(:fields) { vcard.instance_variable_get(:@fields) }
+
+      it 'should set the version' do
+        vcard.version.should == '3.0'
+      end
+
+      it 'should add the properties to the fields array' do
+        fields.should have_key('n')
+        fields.should have_key('fn')
+        fields.should have_key('photo')
+        fields.should have_key('x-socialprofile')
+      end
+    end
+  end
+
+  describe '.parse_all!' do
+    context 'with a valid 4.0 vCard string' do
+      it 'should return an enumerator of vCards' do 
+        data = File.read(File.dirname(__FILE__) + '/../helpers/doe_family.vcf')
+        vcards = VCardigan.parse_all!(data)
+
+        expect(vcards).to be_an_instance_of(Enumerator)
+
+        vcards = vcards.to_a
+        expect(vcards.size).to eq(2)
+        expect(vcards).to all(be_an_instance_of(VCardigan::VCard))
+
+        vcards = []
+        VCardigan.parse_all!(data) do |vcard|
+          vcards << vcard
+        end
+
+        expect(vcards.size).to eq(2)
+        expect(vcards).to all(be_an_instance_of(VCardigan::VCard))
+      end
+    end
+
+    context 'with a valid 4.0 vCard io' do
+      it 'should return an enumerator of vCards' do 
+        data = File.open(File.dirname(__FILE__) + '/../helpers/doe_family.vcf', 'r')
+        vcards = VCardigan.parse_all!(data)
+
+        expect(vcards).to be_an_instance_of(Enumerator)
+
+        vcards = vcards.to_a
+        expect(vcards.size).to eq(2)
+        expect(vcards).to all(be_an_instance_of(VCardigan::VCard))
+
+        vcards = []
+        data.rewind
+        VCardigan.parse_all!(data) do |vcard|
+          vcards << vcard
+        end
+
+        expect(vcards.size).to eq(2)
+        expect(vcards).to all(be_an_instance_of(VCardigan::VCard))
+      end
+    end
+
+    context 'with an invalid vCard' do
+      it 'parses what it can and then rasies an error' do
+        data = File.open(File.dirname(__FILE__) + '/../helpers/scrambeled_doe_family.vcf', 'r')
+
+        vcards = []
+
+        expect do
+          VCardigan.parse_all!(data) do |vcard|
+            vcards << vcard
+          end
+        end.to raise_error(VCardigan::EncodingError)
+
+        expect(vcards.size).to eq(1)
+        expect(vcards.first).to be_an_instance_of(VCardigan::VCard)
+      end
+
+      it 'parses what it can when passed skip_invalid: true' do
+        data = File.open(File.dirname(__FILE__) + '/../helpers/scrambeled_doe_family.vcf', 'r')
+
+        vcards = []
+
+        VCardigan.parse_all!(data, skip_invalid: true) do |vcard|
+          vcards << vcard
+        end
+
+        expect(vcards.size).to eq(1)
+        expect(vcards.first).to be_an_instance_of(VCardigan::VCard)
+      end
+    end
+  end
 end
diff --git a/spec/helpers/doe_family.vcf b/spec/helpers/doe_family.vcf
new file mode 100644
index 0000000..c68993b
--- /dev/null
+++ b/spec/helpers/doe_family.vcf
@@ -0,0 +1,15 @@
+BEGIN:VCARD
+VERSION:4.0
+N:Doe;John;;;
+FN:John Doe
+END:VCARD
+BEGIN:VCARD
+VERSION:4.0
+N:Doe;Jane;;;
+FN:Jane Doe
+END:VCARD
+
+
+
+
+
diff --git a/spec/helpers/multiple_begin.vcf b/spec/helpers/multiple_begin.vcf
new file mode 100644
index 0000000..83d4f0d
--- /dev/null
+++ b/spec/helpers/multiple_begin.vcf
@@ -0,0 +1,7 @@
+BEGIN:VCARD
+VERSION:4.0
+FN:Joe Strummer
+N:Strummer;Joe;;;
+BEGIN:VCARD
+EMAIL;type=INTERNET;type=HOME:joe@example.com
+END:VCARD
diff --git a/spec/helpers/no_begin.vcf b/spec/helpers/no_begin.vcf
new file mode 100644
index 0000000..351ab88
--- /dev/null
+++ b/spec/helpers/no_begin.vcf
@@ -0,0 +1,5 @@
+VERSION:4.0
+FN:Joe Strummer
+N:Strummer;Joe;;;
+EMAIL;type=INTERNET;type=HOME:joe@example.com
+END:VCARD
diff --git a/spec/helpers/no_end.vcf b/spec/helpers/no_end.vcf
new file mode 100644
index 0000000..bfc1636
--- /dev/null
+++ b/spec/helpers/no_end.vcf
@@ -0,0 +1,5 @@
+BEGIN:VCARD
+VERSION:4.0
+FN:Joe Strummer
+N:Strummer;Joe;;;
+EMAIL;type=INTERNET;type=HOME:joe@example.com
diff --git a/spec/helpers/no_fullname.vcf b/spec/helpers/no_fullname.vcf
new file mode 100644
index 0000000..ff25f9b
--- /dev/null
+++ b/spec/helpers/no_fullname.vcf
@@ -0,0 +1,5 @@
+BEGIN:VCARD
+VERSION:4.0
+N:Strummer;Joe;;;
+EMAIL;type=INTERNET;type=HOME:joe@example.com
+END:VCARD
diff --git a/spec/helpers/no_version.vcf b/spec/helpers/no_version.vcf
new file mode 100644
index 0000000..0a88060
--- /dev/null
+++ b/spec/helpers/no_version.vcf
@@ -0,0 +1,5 @@
+BEGIN:VCARD
+FN:Joe Strummer
+N:Strummer;Joe;;;
+EMAIL;type=INTERNET;type=HOME:joe@example.com
+END:VCARD
diff --git a/spec/helpers/scrambeled_doe_family.vcf b/spec/helpers/scrambeled_doe_family.vcf
new file mode 100644
index 0000000..c96a17f
--- /dev/null
+++ b/spec/helpers/scrambeled_doe_family.vcf
@@ -0,0 +1,10 @@
+VERSION:4.0
+N:Doe;John;;;
+FN:John Doe
+BEGIN:VCARD
+VERSION:4.0
+N:Doe;Jane;;;
+FN:Jane Doe
+END:VCARD
+BEGIN:VCARD
+BEGIN:VCARD
diff --git a/spec/helpers/scrambeled_joe.vcf b/spec/helpers/scrambeled_joe.vcf
new file mode 100644
index 0000000..0b2584d
--- /dev/null
+++ b/spec/helpers/scrambeled_joe.vcf
@@ -0,0 +1,6 @@
+EMAIL;type=INTERNET;type=HOME:joe@example.com
+BEGIN:VCARD
+VERSION:4.0
+FN:Joe Strummer
+END:VCARD
+N:Strummer;Joe;;;
diff --git a/vcardigan.gemspec b/vcardigan.gemspec
index 9a62b89..fae6e12 100644
--- a/vcardigan.gemspec
+++ b/vcardigan.gemspec
@@ -12,6 +12,6 @@ spec = Gem::Specification.new do |s|
   s.files = Dir['lib/**/*.rb']
   s.test_files = Dir['spec/**/*.rb']
   s.has_rdoc = false
-  s.add_development_dependency 'rspec', '~> 2.0'
+  s.add_development_dependency 'rspec', '~> 3.0'
   s.add_development_dependency 'pry'
 end