Abstract: A digital file is associated with a security attribute related to watermarking criteria. The digital file content is encrypted, and may not be decrypted by a receiving computer unless the watermarking criteria is met. The receiving computer may decrypt only the encrypted portion of the security attribute unless the watermarking criteria are continuously met at the receiving computer. Improved security and reduction of pirating of the digital content is therefore provided.

Abstract: A method for controlling access to a digital file includes: associating digital content with a header, the header including data identifying a permitted access identity corresponding to a physical key removable from a reading computer. The method also includes encrypting the header and the digital content, the header being susceptible to decryption separate from the content by a key interface.

Abstract: A digital file is associated with a security attribute related to watermarking criteria. The digital file content is encrypted, and may not be decrypted by a receiving computer unless the watermarking criteria is met. The receiving computer may decrypt only the encrypted portion of the security attribute unless the watermarking criteria are continuously met at the receiving computer. Improved security and reduction of pirating of the digital content is therefore provided.

Abstract: A digital file is associated with a security attribute in which identification data for a physical key is stored. The digital file content is encrypted, and may not be decrypted by a receiving computer unless a removable physical key that can be associated with the receiving computer includes identification data which matches the identification data stored in the file's security attribute. The digital content encrypted in the file may be compressed, and a portion of the security attribute may also be encrypted. When a portion of the security attribute is encrypted, the receiving computer may decrypt only the encrypted portion of the security attribute unless the identification data of the security attribute matches the identification data of a physical key physically or wirelessly coupled to the receiving computer. Improved security and reduction of pirating of the digital content are therefore provided.

Abstract: A method for controlling access to a digital file includes: associating digital content with a header, the header including data identifying a permitted access identity corresponding to a physical key removable from a reading computer. The method also includes encrypting the header and the digital content, the header being susceptible to decryption separate from the content by a key interface.

Abstract: A digital file is associated with a header in which identification data for a physical key is stored. The digital file content is encrypted, and may not be decrypted by a receiving computer unless a removable physical key that can be associated with the receiving computer includes identification data which matches the identification data stored in the file header. The digital content encrypted in the file may be compressed, and the header may also be encrypted. When the header is encrypted, the receiving computer may decrypt only the header unless the identification data of the header matches the identification data for a removable physical key. Improved security and reduction of pirating of the digital content are therefore provided.

Abstract: A digital file is associated with a security attribute in which identification data for a physical key is stored. The digital file content is encrypted, and may not be decrypted by a receiving computer unless a removable physical key that can be associated with the receiving computer includes identification data which matches the identification data stored in the file's security attribute. The digital content encrypted in the file may be compressed, and a portion of the security attribute may also be encrypted. When a portion of the security attribute is encrypted, the receiving computer may decrypt only the encrypted portion of the security attribute unless the identification data of the security attribute matches the identification data of a physical key physically or wirelessly coupled to the receiving computer. Improved security and reduction of pirating of the digital content are therefore provided.

Abstract: A digital file is associated with a header in which identification data for a physical key is stored. The digital file content is encrypted, and may not be decrypted by a receiving computer unless a removable physical key that can be associated with the receiving computer includes identification data which matches the identification data stored in the file header. The digital content encrypted in the file may be compressed, and the header may also be encrypted. When the header is encrypted, the receiving computer may decrypt only the header unless the identification data of the header matches the identification data for a removable physical key. Improved security and reduction of pirating of the digital content are therefore provided.