What it can mean
The brand may use the content forever, across campaigns or channels, without coming back to renew the license.
Perpetual usage rights should change your quote.
When a brand wants unlimited or perpetual usage, they may be asking for long-term commercial value from one content fee.
Calculate perpetual usage →Why it is risky
Your old content can keep selling for the brand while you receive no additional usage payment.
What to clarify
Ask whether usage is truly perpetual, whether paid ads are included, and whether this is a buyout or just a license.