1. Using digital signature: A digital signature is a method of associating a certificate and a private key with a code to verify the identity and integrity of the code. You can use digital certificates to sign VBS scripts and invalidate them when certificates expire.
2. Use encryption algorithm: Various encryption algorithms can be used to encrypt VBS scripts, such as AES and DES, which can prevent unauthorized users from viewing or modifying scripts.
3. Check the date: You can add code in the VBS script to check whether the current date is within the validity period. If it is not within the validity period, the script will not run.