In a time-share plan offering time-share use interests, the developer shall not encumber the accommodations of the time-share plan in a manner that could materially and adversely affect the use rights of the purchasers of the accommodations without the written assent of not less than 51 percent of the time-share interest owners other than the developer. This section shall not prevent the developer from encumbering the purchaser’s use rights so long as the developer has sufficient protection as permitted by Section 11244.