Endpoint Encryption

First of all, hello to everyone! 
Now, I received two files about ~3 GB, they are some videos i need to edit, but on first thought they had .XML and I didn't knew what to do with them, later I found out they were encrypted in a some agency that sent me that videos, I have a password needed for decryption, but I don't know how to do it or with what proper software, I tried with endpoint and removable media encryption, and drive encryption, which I dont need, so I need to ask you how to decrypt that files and with what software if it's possible for you to help me. 

Cheers, thanks in advance ;)

Maybe the post is a bit confusing but I'm not so good at English.

hi,

When Removable Storage is encrypting the files, it also creates the "SEERemovableStorageAccessUtility" application on the same media. You should run it in order to be able to access the enrypted files. You can decrypt them to a new location. The procedure how to do it is described in Chapter 6 in "Decryption" section under "Decrypt to Location" of the following document:

https://support.symantec.com/en_US/article.DOC5558.html attachment "SEE-RS 8.2.1 User Guide.pdf"

Hi,

have you tried to ask the one, that sent you that files, what you have to do (and how)?