Vatican website translation:
B) Norms drawn from the hierarchic and communal nature of the Liturgy
26. Liturgical services are not private functions, but are celebrations of the Church, which is the “sacrament of unity,” namely, the holy people united and ordered under their bishops.
Therefore liturgical services pertain to the whole body of the Church; they manifest it and have effects upon it; but they concern the individual members of the Church in different ways, according to their differing rank, office, and actual participation.
B) Normae ex indole Liturgiae utpote actionis hierarchicae et communitatis propriae
26. Actiones liturgicae non sunt actiones privatae, sed celebrationes Ecclesiae, quae est “unitatis sacramentum”, scilicet plebs sancta sub Episcopis adunata et ordinata.
Quare ad universum Corpus Ecclesiae pertinent illudque manifestant et afficiunt; singula vero membra ipsius diverso modo, pro diversitate ordinum, munerum et actualis participationis, attingunt.
Slavishly literal translation:
B) Norms from the character of the Liturgy as proper to the action of a hierarchy and a community
26. Liturgical actions are not private actions, but are celebrations of the Church, which is a “sacrament of unity,” that is to say, a holy people gathered and organized under Bishops. [St. Cyprian of Carthage: Concerning the Unity of the Catholic Church, 7]
Therefore they [the liturgical actions] apply to the whole Body of the Church, they manifest it, and they affect [it]; however they touch the individual members each in a different way, according to the variety of orders, tasks/offices, and active participation.
Having established general norms for the reform/restoration/renewal of the Liturgy, the Council Fathers now list some norms drawn from the nature of the Liturgy as both communal (a gathering of the baptized [and those seeking baptism]) and hierarchical (an assembly of the baptized differentiated by orders [lay/clerical], tasks/offices [e.g., principal celebrant/concelebrating presbyter], and active participation [e.g., server, choir member]).
The strongest principle articulated here is that liturgical actions are public acts, celebrations of the Church, from which it will be deduced that forms of celebration that highlight the communal dimension of the liturgy are preferred to those that are (quasi-)private. Readers of the Pray Tell blog may wish to discuss liturgical practices which embody or challenge this principle over the last fifty years. Examples might include the multiplication of “private” Masses in religious communities vs. Eucharistic concelebration, communal vs. individual celebration of infant baptism, preference for Form I of sacramental reconciliation, etc.