This document shows you how to use a third-party player to play encrypted (SimpleAES) videos of VOD.
Overview
To decrypt and play an encrypted video using a third-party player, you need to obtain the playback information.
You will need the following information:
DrmToken (which is used to get the decryption key)
The URL of the video content
Workflow
Get the playback information and signature
After successful authentication, your application server sends the playback information and signature (DrmToken) to the client.
Download the video and get the key
A playback URL is generated based on the playback information obtained (DrmToken and content URL). When the player tries to play the video, a request to get the key will be sent automatically.
Decrypt and play the video
The player uses the key obtained to decrypt and play the video.
Generating DrmToken
DrmToken is essentially a variant of JSON Web Token (JWT). It also consists of three parts: the header, the payload, and the signature. However, unlike JWT, VOD connects the three parts with ~.
Header
The header is in JSON format and indicates the algorithm information used. Its content is fixed as follows:
{
"alg":"HS256",
"typ":"JWT"
}
Payload
The payload is in JSON format and includes the player signature parameters. Below is an example:
{
"type":"DrmToken",
"appId":1500014561,
"fileId":"387702307091793695",
"currentTimeStamp":1650964374,
"expireTimeStamp":2147483647,
"random":4220003655,
"issuer":"client"
}
Payload parameters
Parameter
Type
Required
Description
type
string
Yes
The signature type, which should be set to DrmToken.
appId
int64
Yes
The AppId.
fileId
string
Yes
The file ID.
issuer
string
Yes
The issuer, which should be set to client.
currentTimeStamp
int64
Yes
The current time (Unix timestamp).
expireTimeStamp
int64
No
The expiration time (Unix timestamp). If you do not specify this, the signature will not expire.
