Innovations in hash-based block matching facilitate block copy (“BC”) prediction that is more effective in terms of rate-distortion performance and/or computational efficiency of encoding. For example, some of the innovations relate to encoding blocks with hash values determined using hash-based block matching. Other innovations relate to reconstructing blocks using hash values determined with hash-based block matching.

A method of allowing collaboration on an encrypted document stored in a cloud computing network, the encrypted document associated with a first user having a first user account in the cloud computing network, the method comprising: in response to a request from the first user to share the encrypted document, sending a link to a public network destination to a second user address of a second user; receiving a request via the link from an unconfirmed user to access the data in the encrypted document; requesting of the unconfirmed user to login to a second user account on the cloud computing network; authenticating the identity of the unconfirmed user as the second user; upon authenticating the identity of the unconfirmed user as the second user, decrypting the encrypted document to generate a decrypted document; storing the decrypted document in the first user account; granting the second user access to the decrypted file simultaneously to access granted to the first user; subsequent to the first user or the second user editing the decrypted document, encrypting an edited version of the decrypted document; and storing the edited version of the encrypted document in the first user account.

In methods and systems for generating secure verification documents are disclosed, a processor that is associated with a multifunction print device will receive one or more source electronic document files, each of which includes content of one or more source documents, each associated with a unique content creator. The processor will cause a print engine of a multifunction device to print a plurality of verification document sheets, each of which comprises data from at least one of the source documents and includes a unique identifier (ID). After printing each verification document sheet, the processor will cause a scanner of the multifunction device to scan the verification document sheet to capture a digital image of the verification document sheet. The processor will then save the digital images of the verification document sheets to a data store.