Decryption fails running iOS 14.2

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Correct. C'est un problème causé par Apple. Vous rencontrerez ce problème, quelle que soit la plate-forme sur laquelle vous vous trouvez, à condition d'utiliser un appareil Apple iOS.

Correct. Its an Apple caused issue. You will have this issue no matter what platform you are on provided you are using an Apple iOS device.

I take it that you haven't read any of these threads?

After the last IOS Update I have problems opening Word documentes that are secured with a password. No problem on Macbook but on Iphone and Ipad. 

The opening procedure starts but after typing the password and OK it sais:

"Descryption failed (null)"

Any ideas how to solve this?

Thank you very much, Kai

I diiscovered the work around to this.  After entering your password and getting the "Decryption failed (null)" message you will see a square with a line drawn from the upper right corner to the center of the square.  Tap that square icon, select "Microsoft Word" (I assume if you are attempting to open another type of file that application name will be listed).  Re-enter the password and the file opens.

Kai

In absence of any proposed fix by Microsoft or Dropbox, the best solution appears to be to open the file with your editor.

So far only way I have found around the problem.

Steve

If you have MsOffice great. Otherwise access the files from a different platform convert to pdf and save alongside the original. You should be able to open the pdfs but of course there is not much that you can do with them.