from the same website:
Section 1123(a) of the Bankruptcy Code lists the mandatory provisions of a chapter 11 plan, and section 1123(b) lists the discretionary provisions. Section 1123(a)(1) provides that a chapter 11 plan must designate classes of claims and interests for treatment under the reorganization. Generally, a plan will classify claim holders as secured creditors, unsecured creditors entitled to priority, general unsecured creditors, and equity security holders.
Under section 1126(c) of the Bankruptcy Code, an entire class of claims is deemed to accept a plan if the plan is accepted by creditors that hold at least two-thirds in amount and more than one-half in number of the allowed claims in the class. Under section 1129(a)(10), if there are impaired classes of claims, the court cannot confirm a plan unless it has been accepted by at least one class of non-insiders who hold impaired claims (i.e., claims that are not going to be paid completely or in which some legal, equitable, or contractual right is altered). Moreover, under section 1126(f), holders of unimpaired claims are deemed to have accepted the plan.
as to protection of the debtor;
the filing itself is followed by the court imposed automatic stay. This is not altered by rejection of a plan by any creditor. If a creditor wishes to be excepted from the stay, they must petition the court for that action.
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ultimately, if the plan is accepted by the courts, they are bound to whatever the plan proposes.

