Encryption functionality

[yccool]

Is it possible to add encryption/decryption functionality similar to the one of EPPlus?

[michelebastione]

The OpenXml standard does not actually support document encryption, that's something that the Excel engine implements independently. It's true that you can password protect workbooks but it's fairly pointless given that one could simply open the xml file and change it or remove it entirely. Given these considerations it's not likely the two functionalities will be implemented, especially the first one.

[michelebastione]

Revisiting this problem I now realize my previous comment was incorrect and misguiding in regards to the issue of file encryption not being a part of the OpenXml standard. It's not an easy task so I make no promises, but I will do further research in order to assess the feasibility of an implementation.